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Immediately upon completion of moulding, the moulds are placed into a container with 50 ml water in order to assure 100% relative humidity during curing cycle. Then, the containers with moulds are placed into a curing chamber maintained at 55 ± 2 C. At the end of 23 ± 0 25 hours of curing, the moulds are taken from the container. The specimens are taken from moulds and are stored in room air another one hour for strength test. The strength is regarded as the hydraulic reactivity of the slag. The reason for developing this test method was that the chemical composition of cement used in ASTM C 595 and C 989 could have a significant effect on the strength of the blended cement (Frigione 1986, Mantel 1994).

13), which indicates a decreased mean condensation degree of the anions. 1 M sodium silicate solution. This decrease in conversion is due to the formation of high-polymeric, molybdate-inactive anionic species. 13 Effect of silicate concentration on the molybdate reaction rate of the silicate solutions (based on Hoebbel and Ebert 1988). Alkaline activators 25 anionic species indicated that not only hydrolysis reactions, but also condensation happens when sodium silicate solutions are diluted. Impurities, melting temperature, autoclaving temperature, autoclaving time and storage time also affect the distribution of silicate species.

The strength is regarded as the hydraulic reactivity of the slag. The reason for developing this test method was that the chemical composition of cement used in ASTM C 595 and C 989 could have a significant effect on the strength of the blended cement (Frigione 1986, Mantel 1994). Although this method does not use cement to evaluate the hydraulic reactivity of the slag, different slags may show different sensitivity to NaOH (Shi and Day 1996c). Thus, this method is not good for evaluation of hydraulic reactivity of slags from different sources.